Immunity Zone Slide Rules
406mm
L/45 2240lbs shell
406mm
L/45 2700lbs shell
The new fast battleships
of the North Carolina and South Dakota class received this
variant of the 406mm L/45 gun. Similar in its internal details to the previous
marks, they were considerably lighter than the guns which outfitted the
Marylands, and were mounted on new mounts. These allowed the guns
to fire the brand-new 2700lbs super-heavy shells, which allowed the gun
to outmatch all similar pieces of ordnance and come close to the firepower
of Japan's 18" artillery.
During World War II, modifications to the sleeve allowed this gun to be fitted to the Maryland class, allowing for easier replacement of worn-out barrels on these warships.
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Year of Construction:
~1935
Bore: 406mm Weight of gun: 87,2t / 85.85tons Weight of barrel: ???kg / ??? lbs Length of gun: 18694mm / 736 ins. Length of bore: 18166mm / 715 ins. (45 calibers) Wt. of projectile: 1225 kg / 2700 lbs Muzzle Velocity: 701 m/s / 2300 f/s Max. Range: 33,740 km / 36,000 yds at 45° elevation Ceiling: Not AA capable Max. Elevation: 45° Rate of Fire: 2 rounds/min |